arm64: dts: rockchip: Add Anbernic RG Vita-Pro

Add device tree for the Anbernic RG Vita-Pro, based on the Rockchip
RK3576. All hardware is currently working except for the accelerometer,
the touchscreen, the battery monitor, and DisplayPort over USB-C. PWM
is also missing currently, and as a result the LEDs and panel backlight
are currently controlled via GPIO but will be changed to PWM once
supported.

The Anbernic RG Vita-Pro includes the following hardware:
 - A 1080x1920 DSI display with touch.
 - 21 buttons.
 - 3 LEDs.
 - 64GB eMMC, 2 SDMMC slots.
 - RTL8852BE WiFi (with Bluetooth via UART)
 - 1 USB 3.0 USB-C port in OTG mode.
 - 3.5mm headphone jack with play button support.
 - 5000mAH battery

The following hardware has incomplete driver support and is not yet
working:
 - An Invensense icm42607p accelerometer.
 - A Cellwise cw221x battery monitor.
 - A Synaptics i2c touchscreen.
 - DisplayPort over USB-C alt-mode.
 - PWM controller.
 - 2 Analog joysticks with LED controllers.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://patch.msgid.link/20260728203832.166402-5-macroalpha82@gmail.com
[dropped unused pmic pinconfig definitions, sorted nodes]
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

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